package com.summer.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Date;

/**
 * 作者:夏天
 * qq:1205232048
 */
//保存用户上一次访问的时间
public class CookieDemo03 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //解决中文乱码问题
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");

        //Cookie 服务器端从客户端获取呀
        //这里返回数组 说明Cookie可能存在多个
        Cookie[] cookies = req.getCookies();
        PrintWriter out = resp.getWriter();

        //判断Cookie是否存在
        if(cookies != null){
            //如果存在怎么办
            out.write("你上一次访问的时间是:");

            for (int i = 0; i < cookies.length; i++) {
                Cookie cookie = cookies[i];
                //获取cookie的名字
                if(cookie.getName().equals("lastLoginTime")){
                    //获取cookie中的值
                    //解码
                    out.write(URLDecoder.decode(cookie.getValue(),"UTF-8"));
                }
            }
        }else {
            out.write("这是你第一次访问本站");
        }

        //编码
        Cookie cookie = new Cookie("name", URLEncoder.encode("夏天","utf-8"));
        resp.addCookie(cookie);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
